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The engines power the hydraulic actuators in an aircraft an aircraft of that size cannot be trivially controlled without that hydraulic system. The APU should h
by Arch-TK 1y ago
The engines power the hydraulic actuators in an aircraft an aircraft of that size cannot be trivially controlled without that hydraulic system. The APU should have been started to provide backup power in the case of engine failure but during take-off there is already very little time to do anything and it's possible that the sudden workload overloaded both the pilot and copilot or some other human factors were involved.
That being said, in the video I saw, the aircraft was already going too slow to realistically recover. And all you would get at that point is just an extended duration of glide which at best would let you find a less populated area to crash into.
- consumer451 1y agoYou can hear what sounds a lot like the very distinct sound of the RAT having been deployed in one of the videos. There is also no main turbine sound. This really seems like dual engine failure, for whatever reason. https://old.reddit.com/r/ahmedabad/comments/1l9i1ga/om_shanti_to_everyone/?share_id=FWeAcxJDXum67xe83WaA9 https://old.reddit.com/r/ahmedabad/comments/1l9i1ga/om_shant... https://en.wikipedia.org/wiki/Ram_air_turbine https://en.wikipedia.org/wiki/Ram_air_turbine
- Arch-TK 1y agoI saw you mentioning this but the RAT on the 787 sticks out of the bottom and should have been visible at around :04 seconds into that video when the aircraft silhouette is visible clearly against the background. Although it's possible I am just missing from the video. You are right that the sound is quite distinct and can be clearly heard in the video.
- consumer451 1y agoThe RAT is surprising tiny on the 787, and this is a phone video of a monitor, then run through Reddit compression. I am of course not 100% sure about any of this. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ95qKjo2w-eWEKSE-iYN-PRERIvBdr7A6sxA&s https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ95qKj... edit: here you might possibly see it on the right, a very tiny blurry thing https://imgur.com/a/CElWKzQ https://imgur.com/a/CElWKzQ source: https://old.reddit.com/r/aviation/comments/1l9hqzp/air_india_flight_171_crash/mxcn99k/ https://old.reddit.com/r/aviation/comments/1l9hqzp/air_india...
- Arch-TK 1y agoYeah I saw that picture and came back here. I think you are 100% right that the RAT is deployed. From the video of the runway it also seems like the aircraft didn't do a short takeoff (ADS-B location data is always crappy on the ground in my experience so this is entirely unsurprising). There was a "smoke cloud" from behind the left engine which could also have just been a dust cloud right after rotation. The flaps allegedly could be at only 5° (which is why they're so hard to spot) because of the runway inclination. The mystery thickens...
- chinathrow 1y agoThere is a video circulating that the air con was off on the previous flight - that might indicate why the APU was off for the crash flight as well.
- Arch-TK 1y agoAir conditioning is powered by bleed air from the engines (or the APU or a ground source). The APU wouldn't be running during any normal flight, it's normally only ever used on the ground when the engines are off and there's no external power source. So I am not sure what you are trying to say here, sorry.
- foldr 1y agoThe 787 doesn’t use bleed air to power anything.
- chinathrow 1y ago> There is a video circulating that the air con was off on the previous flight ... on the ground - sorry I forgot to add that.